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Purposive Sampling as a Tool for Informant Selection

Ethnobotany Research & Applications 5:147-158 (2007)Ma. Dolores C. Tongco, Department of Botany, University of Hawai`i at Manoa, 3190 Maile Way, Honolulu, HI, 96822 and Institute of Biology, University of the Philippines, Diliman, Quezon City, 1101, MethodsAbstract Informant Selection is highly relevant for ethnobotanical research, as people are constantly looked upon for knowl-edge and information. The Purposive Sampling technique is a type of non-probability Sampling that is most effective when one needs to study a certain cultural domain with knowledgeable experts within. Purposive Sampling may also be used with both qualitative and quantitative re-search techniques. The inherent bias of the method con-tributes to its efficiency, and the method stays robust even when tested against random probability Sampling .

can and are willing to provide the information by virtue of knowledge or experience (Bernard 2002, Lewis & Shep-pard 2006). Purposive sampling is especially exemplified through the key informant technique (Bernard 2002, Gar-cia 2006, Gustad et al. 2004, Jarvis et al. 2004, Lyon & Hardesty 2005), wherein one or a few individuals are so-

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